Proceedings of International Conference on Perovskite Thin Film Photovoltaics and Perovskite Photonics and Optoelectronics (NIPHO25)
Publication date: 24th April 2025
Single crystal hybrid perovskites (SCHP) are promising materials for optoelectronic applications due to excellent properties such as homogeneity, reduced defects, lack of grain boundaries [1]. 2D SCHP show great potential for future applications as they offer advantages such as improved stability, improved carrier lifetimes, tuneable optical, electrical properties, significant light absorption coefficient [2,3]. Additionally, these materials offer multiple quantum well structures that results in improved exciton binding energy and strong quantum confinement effects, while large organic A cation further improves chemical and environmental stability [4].
In this presentation, we discuss recent results on the growth of lead-free thin 2D PEA2SnI4 and F-PEA2SnI4 single crystals grown using the space-confined approach. We investigate the structural, optical properties, and stability of the materials under environmental conditions by studying the change in the photoluminescence intensity as a function of time. Optical microscope images confirm the formation of 100-150 μm thick single crystal films of both PEA2SnI4 and F-PEA2SnI4 with emission band around ~632 nm. XRD analysis of both SCHP films showed regularly spaced diffraction peaks suggesting a homogenous crystal orientation. The stability studies as observed by the change of photoluminescence intensity as a function of time, revealed the instability of Sn perovskites, which could be due to oxidation under environmental conditions, more prominent in case of continuous light illumination. Further improvement in the stability could be achieved by implementing strategies for improving the materials stability, such as encapsulation or additive engineering.
Keywords: Sn single crystal films, 2D Sn perovskites, lead-free, stability
Italian Ministry for University and Research (MUR), PRIN 2022 grant 2022HWWW3S (FQ), PRIN 2022 PNRR grant P2022W9773 (FP, FQ), Convenzione triennale tra Fondazione di Sardegna (FdS) e Università degli Studi di Cagliari (UniCA), FdS 2022 grant F73C23001820007 (FQ), FdS grant F73C22001160007 (DM, GB, MS, AM), PRIN 2022 PNRR grant 2022EHER2H (DM), PRIN 2022 grant 2022F2K7J5 (AM), Associazione Università Sulcis Iglesiente (AUSI), delibera CTS del 05-03-2019 e rinnovi successivi (AM, GB, FQ, MS, DM), PRIN 2022 grant P20224PJJN (GB, AM, DM), PRIN 2022 grant 2022XP37C7 (GB), PRIN 2022 2022YM3232—NanoPix (MS), PRIN 2022 PNRR P2022ZYTJY—Master (MS), PON “Ricerca e Innovazione” 2014–2020—Fondo sociale europeo, Attraction and International Mobility—Codice AIM1809115 Num. Attività 2, Linea 2.1 (AS), Project “Network 4 Energy Sustainable Transition—NEST”, Spoke 1, Project code PE0000021, funded under the National Recovery and Resilience Plan (NRRP), Mission 4, Component 2, Investment 1.3—Call for tender No. 1561 of 11.10.2022 of Ministero dell’Università e della Ricerca (MUR); funded by the European Union—NextGeneration EU. (VD), Ecosystem of Innovation for Next Generation Sardinia, Spoke 7—Project code ECS00000038, Low carbon technologies, funded under the National Recovery and Resilience Plan (NRRP), Ministero dell’Università e della Ricerca (MUR); funded by the European Union—NextGenerationEU (AM).
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